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A dual-mode visible light communication method and system

A visible light communication and optical signal technology, applied in the field of visible light communication, can solve problems such as limited application scope, and achieve the effects of flexible application scenarios, high transmission performance, and low complexity

Active Publication Date: 2019-08-23
CHINA ACADEMY OF INFORMATION & COMM
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Problems solved by technology

Even considering high-order modulation, its final transmission rate is only on the order of 100bps, and its application range is relatively limited

Method used

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  • A dual-mode visible light communication method and system
  • A dual-mode visible light communication method and system
  • A dual-mode visible light communication method and system

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Embodiment Construction

[0023] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0024] The present invention proposes a dual-mode visible light communication system based on a consumer-grade camera, which can simultaneously support both Undersampled pulse width modulation (UPWM) and variable pulse position modulation (Variable pulse position modulation, VPPM) Communication mode, realizing a system compatible with both high-speed ...

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Abstract

The invention discloses a dual-mode visible light communication method and a dual-mode visible light communication system, the method comprises the following steps: converting a symbol corresponding to first original data into a multi-level signal; modulating second original data pulse width according to the multi-level signal to generate a RS-VPPM symbol signal, wherein each UPWM symbol period contains a plurality of continuous RS-VPPM symbol signals; converting the UPWM symbol signal into an optical signal; receiving the optical signal through an under-sampling mode, and obtaining an averagebrightness value in each UPWM symbol period; according to variation of the average brightness value with time, restoring the first original data; through a rolling shutter mode, obtaining a stripe image of each RS-VPPM symbol, and restoring the second original data; calculating a duty ratio of a RS-VPPM signal according to the stripe image, and restoring the first original data. An apparatus comprises a symbol mapping module, a UPWM modulation and demodulation module, a RS-VPPM modulation and demodulation module, a camera, a data restoring module, and so on. The method and the system providedby the invention take account of the characteristics of relatively higher transmission performance, flexible application scenes and low complexity.

Description

technical field [0001] The present application relates to the field of communication, and in particular to a method and system for visible light communication. Background technique [0002] Visible light communication is a wireless communication method that uses lighting LEDs as signal transmitters. Due to the characteristics of high-speed modulation of LEDs and the widespread popularity of LED lighting systems, visible light communication has received extensive attention recently. Visible light communication based on camera is also called visible light imaging communication. It uses widely existing cameras as receivers of LED light signals, and has the advantages of low application cost and low promotion resistance. [0003] With the popularization of smart devices such as smartphones and tablet computers, ordinary users basically have consumer-grade cameras, which makes imaging communication based on consumer-grade cameras the easiest visible light communication applicati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/116
Inventor 余冰雁程强
Owner CHINA ACADEMY OF INFORMATION & COMM
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